单选题You should lower the ensign when the sun sets.（）A日出时应该升国旗。B日出时应该降国旗。C日落时应该降国旗。D日落时应该升国旗。
单选题
You should lower the ensign when the sun sets.（）
A
日出时应该升国旗。
B
日出时应该降国旗。
C
日落时应该降国旗。
D
日落时应该升国旗。
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